0 lp to a single loss and demote?

Could someone explain to me how I was 16 lp made a loss which took me exactly 16 lp and left me on 0 lp then made another loss and was demoted.To give some context my mmr was not low its was even high you can guess from it only taking me 16 lp per loss but im also mad cause my friend made 6 losses in a row in the same division on 0 lp after he had climbed but he didnt demote?{{champion:412}}
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